The following F2 results occur from a typical dihybrid cross:
purple: A_B_ 9/16
white: aaB_ 3/16
white: A_bb 3/16
white: aabb 1/1
If a double heterozygote (AaBb) is crossed with a fully recessive organism (aabb), what phenotypic ratio is
expected in the offspring?
3 (white):1 (purple)
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With help from fertility specialists, a woman with very low follicle-stimulating hormone and luteinizing hormone levels finally conceives a son. If her genetic condition is from a dominant allele and is passed on to her son, what is the likely result?
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Which body region is protected by fatty acids, acidic pH, lactic acid, and a tough cell barrier with its own normal biota?
A. Skin B. Respiratory tract C. Urinary tract D. Digestive tract E. Eyes
Suppose a cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from _____
A) a bacterium B) an animal but not a plant C) nearly any eukaryotic organism D) a plant but not an animal